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| auto slips from 2nd to 3rd | |
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| Tweet Topic Started: Sun Jul 19, 2015 9:15 pm (1,118 Views) | |
| ammar786 | Sun Jul 19, 2015 9:15 pm Post #1 |
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hello since yesterday ive noticed that whenever my car changes from 2nd to 3rd it revs right up then changes, like its slipping. what can cause it, could it be the modulator on the gearbox or would that cause problems for all the gears. or could it just be that I need to change the oil and filter? any help is appreciated as its really annoying when setting off |
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| stwat | Sun Jul 19, 2015 9:50 pm Post #2 |
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It's called flaring between shifts. Plenty of info on the web but here's a thread about it with a potential fix. http://www.peachparts.com/shopforum/tech-help/311017-sudden-transmission-flaring-91-300e.html It involves changing the K1 spring in the gearbox. Not that hard to do whilst you have the sump off to change the oil and filter. Here's a thread about it, http://mercedes-190.co.uk/topic/6721725/1/ Edited by stwat, Sun Jul 19, 2015 9:52 pm.
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| ammar786 | Sun Jul 19, 2015 10:06 pm Post #3 |
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thanks for that great info |
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| ammar786 | Sun Jul 19, 2015 10:17 pm Post #4 |
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obviously I need to change the k1 spring but is it worthwhile changing the k2 spring aswell |
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| Gnasha | Sun Jul 19, 2015 10:40 pm Post #5 |
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try search videos like this first this guy is boring but hes good https://www.youtube.com/watch?v=gM4KZvwsCW0 id start with changing the oil and filter and check the condition of the oil, colour, oil smell etc. Pour some on a piece of Spam Spam Spam Spam towel and let it dry it will reveal and contaminates. Good luck |
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| worthingmercedes | Mon Jul 20, 2015 7:58 am Post #6 |
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Wowww really? We in the garage would never do that in a million years before checking the modulator! Once you have done that then you can go onto the next steps, good luck |
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| ammar786 | Mon Jul 20, 2015 1:18 pm Post #7 |
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What is the best way to test and check the modulator |
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| mxfrank | Sat Jul 25, 2015 4:41 pm Post #8 |
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Don't do it. If you had a modulation problem, you'd notice it across all the gear ranges. You have your answer...2-3 flares are almost always caused by a weak or broken K1 spring. You need to pull the pan and filter when you replace it, so this one repair covers a lot of potential problem areas. |
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| stwat | Sat Jul 25, 2015 5:01 pm Post #9 |
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^+1 |
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| ammar786 | Fri Aug 7, 2015 2:54 pm Post #10 |
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Hi fellas I changed my k1 spring by following a guide i found on the forum, i also changed the filter and fluid and topped it up to the correct level. However i still have the flare between 2nd and 3rd. What else can cause this issue as its frustrating me alot now |
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| worthingmercedes | Fri Aug 7, 2015 3:48 pm Post #11 |
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I take it you did not check the modulator? |
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| ammar786 | Fri Aug 7, 2015 8:31 pm Post #12 |
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How do i check the modulator I had a look at the black cap and the vacuum hose which all seemed fine Whatelse do i need to check? |
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| worthingmercedes | Fri Aug 7, 2015 10:49 pm Post #13 |
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Leaks, O ring or needs adjusting, job done! Regards Chris |
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| Michael | Fri Aug 7, 2015 11:34 pm Post #14 |
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Needs Help
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If you've got a garage near you, go there . They should be able to sort it out. |
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| eagle3 | Fri Aug 7, 2015 11:37 pm Post #15 |
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Therapy Needed
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https://mercedessource.com/problems/transmission/diagnosing-adjusting-and-fine-tuning-mercedes-automatic-transmissions |
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| ammar786 | Sun Aug 9, 2015 11:13 pm Post #16 |
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do I need to drop the gearbox a bit to adjust the modulator, it seems very tight to get my hands in? I also noticed that once the gearbox is up to temperature it doesn't flare, well its not noticeable |
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| worthingmercedes | Mon Aug 10, 2015 10:33 am Post #17 |
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You or someone needs to test the pressure of the modulator first before you do anything or you will not know how much to adjust or if it's leaking, regards chris |
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| ammar786 | Sat Aug 15, 2015 11:05 pm Post #18 |
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is there a guide anywhere on how to adjust the modulator, I can not get my hands in to adjust it there is no space at all. where can I get a pressure tester from for the modulator? |
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8:23 PM Jul 11